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<html lang="zh-CN">
<head>
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    <title>POPYU - 你们总是让我幡然醒悟</title>
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<body>
    <header class="header">
        <div class="container">
            <div class="logo">
                <h1>POPYU</h1>
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            <nav class="nav">
                <ul>
                    <li><a href="#" class="active">首页</a></li>
                    <div id="navCategories"></div>
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            </nav>
            <div class="search">
                <input type="text" placeholder="搜索课程">
                <button type="button">搜索</button>
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    <main class="main">
        <div class="container">
            <div class="course-categories">
                <h2>课程分类</h2>
                <ul id="categoryList"></ul>
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                <div class="course-filter">
                    <span>分类：</span>
                    <div id="filterCategories"></div>
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                <div id="courseContainer" class="course-container"></div>
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